From Cppreference
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template< class... Types, class Alloc >
struct uses_allocator< std::tuple<Types...>, Alloc > : std::true_type { };
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This specialization of std::uses_allocator informs other library components that tuples support uses-allocator construction, even though they do not have a nested allocator_type.
Members
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bool constant with value true
(public static member constant)
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[edit] Example
// myalloc is a stateful Allocator with a single-argument constructor
// that takes an int. It has no default constructor.
typedef std::vector<int, myalloc<int>> innervector_t;
typedef std::tuple<int, innervector_t> elem_t;
typedef std::scoped_allocator_adaptor< myalloc<elem_t>, myalloc<int>> Alloc;
Alloc a(1,2);
std::vector<elem_t, Alloc> v(a);
v.resize(1); // uses allocator #1 for elements of v
std::get<1>(v[0]).resize(10); // uses allocator #2 for innervector_t
[edit] See also
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checks if the specified type supports uses-allocator construction
(class template)
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